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I don't understand question #1. Maybe you can rephrase?

#2 requires a mix of (i) reference interviews, and (ii) digging into details during candidate interviews. Read these books to learn how:

* Who: https://www.amazon.com/Who-Geoff-Smart/dp/0345504194

* Topgrading: https://www.amazon.com/Topgrading-3rd-Promoting-Turbocharges...

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